Egbert ceeuzbaue



@latten grutas @anni @frn -ROBERT CEEUZBAUR, 0F NEWARK, NEW JERSEY.

raum Panam. 66,303, ama Juzg, 2, 1867.

IMPROVEMENT IN GONNETING-LINKS.

TO ALL WHOM IT MAY CONGERN:

Beit known that IVROBERTCREUZBAUR, of thc city of Newark, and county of Essex, in the .State of New Jersey, have invented an improved Connecting-Link; and I do hereby declare that the following is a-full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in whichn Figure 1 represents a side view of the closed link. l

Figure 2, an edge'view ofthe closed link.

' Figure 4, a cross-section ofthe closed link. s

'Figure 3, a section of the closed link through its' longest diameter; and

Figure 5, a side view of an open link.

Similar letters of reference indicate corresponding parts in the several igures.

The object of my inventionn is to produce a connecting-link of easy construction, of greatest strength with the least material, and oiieasyi'operation in its application. 1

To-enable others skilled in the art to understand my invention,I will describoits construction and operation.

This link is formed of the two parts and B, which are identical in shape and similar in form to the letter C. They are pivoted together at one end with a rivet, d, with their openings on opposite sides, and may, when closed, be locked at the other end through liole e by a'leather thong, or by a screw, or by a rivet, as may best suit the greater or less frequency of detaching the same in its various applications. It is, however, not necessary to lock it in any way, as the parts4 connected thereby mustbe held in a particular manner before the link can be opened, as will fully appear here below. Taking the dimensions x given in thedrawings as an example, this link is constructed by cutting ,73 inch round rod iron into lengths a triiie over six inches long, which are bent cold into an approximate C-shape, and while hot swaged into the desired form. This form is 'so proportioned that the iron will be equally consumed in allits length, while it is put in such shape as to give to the link the strongest form with the best shape. This particular link taken as an illustration beingV made of {'E inch round iron,would be equal in strength to a common chain link made of ,"3 inch iron, provided the material he alike, and provided this link be suiciently stift' at the ends to prevent their opening out. Now, whereas it is contemplated to make this link of superior material, the quality of which will always be tested by bending it cold into approximate shape, and still more improved by swaging, iirst hot and then cold, as well as by tnmbling, the tensile strength of'such a link can safely be taken as double that of usual iron, such as would be found in chains,swingletree irons, tc., with which the link would be used. As the two parts A and B are precisely alike, the following minute description of their'farther construction is to be Iconsidered as referring to one of them only, which will make the explanation more clear. IFor the reason stated, the opening O g must be large enough to admit iron of a diameter, the corresponding circle of which would give twice the area of the crosssection of the iron u sed in this link. i In this'case such diameter would he ,662,5 inches, which is made the width of the opening O g, and the same measurement is adopted for the width of the sides or parallel parts of the link, as marked in the several figures. Dividing ,2,50 square inches (the area of a circle seven-sixteenths of an inch lin diameter) by ,0,5% gives ,2546 as the thickness of each link in the middle, and all along its parallel sides, (or rather ,2655 to allow for rounding off of corners.) The width at the extreme ends, leugthways ofthe link, is made one and one-fourth times the-width on the sides, which in this case isabout T7675 -of an inch, which decreases beth ways to the width of the parallel sides. The thickness at any part is made so as. to consume the iron (in this case seven-sixteenths of an inch in diameter) alike all round, which results in a thickness of $60 inches at the extreme ends. The width at the ends, ,7576, is divided into seven parts. Two such parts form the diameter of the pivot d and ofthe opposite hole e. Two parts are placed outside of the pivot d and hole e, and three parts' inside of these, Ybecause it does not take as much metal to withstand the compression resulting outside from the tendency of the ends to straighten out as it does to withstand the tensile strain inside, and the pivot and c holes Vare thus placed as nearly as practicable in the neutral `centre between these two counteracting forces.V

The resistance against the tendency to straighten out being as the square of this width, the shape here given is most favorable ,to resist this tendency. The inside opening, enclosed by therlink, is made one and one-sixth times the opening Og, which in this case results in ,7036 inches. The parallel sides are made at least twice the length of the openings O g, and the two openings O g in the complete link-that is in the two parts A B pivoted together-are made, the one above and the other below the transverse axis of the link,'and immediately adjoining the same, as shown. The outside 'edges of the opening O g are rounded -oil" to give free admssion to the parts to be connected bythe link, and the inside corners of these openings areleft standing, so as the better to prevent an accidental opening of the link. i In opening or closing the link, the two parts connected or to be connected must be held transversely to the link,.eaeh part opposite to the corresponding opening in the link. This is not done simultaneously in ,the act of closing it, but simultaneously in the act of opening, which shows that accidental detachment is hardly to be looked for, and that the look-hole e is hardly necessary.

More particularly toipoint out wherein this link differs from and is superior to other connecting-links, I will compare it to the one most analogous to it, and considered the best extant before this invention, to wit, the one patented to John I. Kirk, under date November 13, 1860, formed of two s -shaped parts pivoted together l in the centre.` First, the ends of both links are formed *0f-two parts each, so thatthe strain is divided upon four parts, wher-eas in the middle only two parts resist the strain. The ends, therefore, constructed in the manner as pointed out abovel are stronger than the middle, and can well bear to be weakened by the pivot and lockholes,.as is done'in this C link. The S link, however, must be pivoted in the middle, and is therefore weakened directly in proportion to the metal removed. Second, The S link, with its two openings to each half, four in all, and its S twist, consumes more material without benefit to its strength. For the sam'e reasons it is more diiicult of construction that the C link, which has only two openings and parallel sides. Third, with the-S link the two parts to be connected must be inserted simultaneously and held there until the four ends close over them. With the C link the parts are inserted independently of each other, and are confined by theibent end 'portions' of the link as soon as inserted, before the latter close upon each other. While closing the link the parts inserted are guided into the opposite opening-s, but this also does not have to be dene simultaneously, as part ofthe motion of closing can intervene. For the same reasons one of the parts connectedv by the C link can be taken out without taking the other out, whereas with the S link both must 'be taken out in order to remove one, unless the link be greatly enlarged in its proportions at the expense of more material and labor.

Having thus described the correct construction of this link, and clearly defined its utility and the advantages gained by this invention, what I claim as new, and desire to secure by Letters Patent, is

1. The two parts A and B, each with one opening, pivoted together at p, with these openings on opposite sides, substantially in the manner as shown and described, and for the purposes named.

2. Strengthening the ends of the link subject to bending by shaping them in the manner named, the twoA parts forming the link being pivoted together through the parts thus strengthened,-substantially as set forth.

ROBERT CREUZBAUR.

Witnesses:

LEWIS C. Gnovnn, Jr., GEO. H. F. GRAY. 

